sulu: FieldDescriptorFactoryInterface not available in webspace context

Q	A
Bug?	yes
New Feature?	no
Sulu Version	2.0.2

Actual Behavior

Cannot autowire service "App\Controller\Admin\PointController": argument "$fieldDescriptorFactory" of method "__construct()" references interface "Sulu\Component\Rest\ListBuilder\Metadata\FieldDescriptorFactoryInterface" but no such service exists. Did you create a class that implements this interface?

Expected Behavior

working list in admin

Steps to Reproduce

http://docs.sulu.io/en/2.0/book/extend-admin.html

Possible Solutions

If you have already ideas how to solve the issue, add them here. (remove this section if not needed)